Reinforcing-bar for cementitious bodies.



PATENTED MAY 15, 1906.

E. F. CRANE.

REINFORGING BAR FOR OEMENTITIOUS BODIES.

APPLICATION FILED AUG. 2, 1905.

INVENTOR.

Edward 176170226 8 Y/w's A 7'7'0l-7NE y WITNESSES:

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-UNITED STATES EDWARD F. ORAN PATENT E, *oF NEWARK, NEW JERSEY.

OFFICE.

To. all whom it may concern:

Be it known that I, EDWARD F. CRANE, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Reinforcing Bars for Cementitious Bodies, of which the following is a specification.

In the use of cementitious substances, such as concrete; for building and other purposes it is customary to reinforce and impart a desired tensile stren th to the same by embedding therein suitable metallic members, such combination of metallic reinforcing members with the cementitious body resulting in the formation of a composite structure capable of resisting both compressive and tensile strains to a very great degree.

When metallic members are thus combined with or embedded in a cementitious body, it is desirable that a complete adhesion and'union of the two elements should be obtained to prevent movement of one relatively to the other, and this is usually accomplished by providing the metallic reinforcing members with a series of transversely-arranged shoulders for interlocking en agement with the cementitious bod T ese interlocking shoulders are usua ly formed by a distortion of some character of the bar constituting the reinforcing member, and such distortion in some instances is of such character as to result in a lessening of the tensile strength of the bar. It is obviously desirable, however, that all the metal entering into or forming part of the bar should be so disposed as to-de velop its full tensile stren th, and it has therefore been the object of my present invention to provide a reinforcing bar of the character referred to in which the metal will e so disposed as to provide transversed shoulders for interlocking engagement with the cementitious body and at the same time develop practically its full tensile strength.

0 this end my invention consists in providing a metallic reinforcing bar or member for cementitious bodies having a plurality of parallel spirals of difierent depths with more or less abruptly-formed shoulders between the same for interlocking engagement with the cementitious body, the said spirals being so arranged that the bar will be of uniform cross-sectional area throughout its length, and therefore of uniform tensile strength.

eferring now to the accompanying draw- Specifieation of Letters Patent. Application an August 2. 190a, 'sera1m. 272,2s7." I

shoulders between the ings, forming part ofthisspecification, Fig- Patented ivra 'is, 1906.

ure 1 is a perspective'view .of a. reinforcingbar embodyingone form ofmy invention.

Fig. 2 is a plan of thesame combined with a cementitious body, hich latter is partially removed-from the bar to disclose the latter, and Fig. 31's a cross-section of the bar through line 3 3 of Fig. 2.

Similar reference characters designate like parts in the several figures of the drawin s.

In the drawings, 12 designates generally a reinforcing bar or member formed in accordance with my invention, and c designates the concrete or other cementitious body in which, as shown in Fig. 2, the said metallic reinforcing-bar b is adapted to be embedded.

The metallic bar I), in accordance with my invention, as hereinbefore stated, is formed with a plurality of parallel spirals of different depths, having more or less abruptly-formed adjacent spirals for interlocking engagement with the cementitious body, the said spirals, asshown in the bar illustrated, being three in number and indicated at 4, 5, and 6, and the said interlocking shoulders between the adjacent spirals bein two in number and indicated at 7 and 8. g bar thus formed will be of uniform cross-sectional area throughout its length, and therefore of uniform tensile stren th, and The transverselyarranged shoul ers formed by the varying depths of the several spirals present such a considerable surface for interlocking engagement with the concrete or other cementitious body as to prevent any possibility of movement of one relatively to the other. 1

The number of spirals with which the re inforcing-bar is provided may of course be varied, as it will be understood that in some instances where a light bar is to be used in connection with a small body of concrete which is not to be subjected to any considerable degree of strain, a less shoulder area for interlocking engagement with the concrete bodywill be required than in a case where a larger reinforcing-bar is to be used in connection with a larger concrete body and one adapted to be subjected to heavier strains. The number of spirals may therefore be varied to provide different areas of in terlocking shoulder-surface, according to the size of the bar or the work to which it is to be applied, without departure from my invention.

IIO

What I claim is 1. A one-piece metallic reinforcing-bar for cementitious bodies having a plurality of substantially flat spirals of different depths, as and for the purpose set forth.

2. A metallic reinforcing-bar having a plurality of substantially flat spirals of different depths with abruptly-formed shoulders b'etween the spirals, as and for the purpose set forth.

3. A metallic reinforcing-bar having a plurality of spirals-of different depths, said spirals havin flat surfaces arranged parallel to the axis 0 the bar with shoulders between the flat faces of the adjacent spirals, as and for the purpose set forth.

4. A-metallic reinforcing-bar for cementi tious bodies having a plurality of parallel saono'i spirals of different depths with an abruptlyformed shoulder between the adjacent spi rals, for the purpose set forth.

5. A composite structure, consisting of a cementitious bodydn combination with a metallic reinforcin -bar embedded therein, the said reinforcingar having a plurality of parallel spirals of different depths with an abruptly-formed shoulder between the adjacent spira Signed at New York, inthe county of New York and State of New York, this 26th day of July, A. D. 1905.

EDWARD F. CRANE.

Witnesses CHAs. F. DANE, E. M. FAITH. 

